Silver Bullet
Spotted a cult of Malar? Consider getting your weapons silvered. Typically, the cost of one weapon or 10 pieces of ammunition to be silvered is 100gp, but it'll be worth it on a full moon.

Perfectly Balanced
If a situation grants you both advantage and disadvantage, they cancel each other out—even if there are multiple instances of either.

Get Down!
Dropping prone gives attackers within 5ft advantage on attacks. Any further away and creatures have disadvantage, so have a lie down until the archers get bored.

Drink Up!
Potions can be administered to unconscious creatures. You'd think this would just be Potions of Healing, but no- you can give your downed comrade the Potion of Gaseous form if you like!

All For One!
In a group check, everybody rolls. If at least half the group succeeds, everyone does! If not...

Exploit vulnerability!
Creatures that have a damage vulnerability take double damage—try different types of attacks to discover them!

Go for the Eyes!
Attack rolls against a blinded creature have advantage, whilst the blinded creature has disadvantage on attack rolls.

Angelic Hoards come forth!
Aasimar are mortal beings touched with heavenly power. They're resistant to both necrotic and radiant damage.

Shove This!
Try pushing people! You can knock someone prone or push them 5ft by making a shove attack. If you can make multiple attacks, you can replace any of them with a shove.

Sweet Talker
If you've charmed a creature, that creature can't attack you or include you in dangerous area-of-effect spells.

Temporary Relief
If you're unconscious, temporary hit points can't restore you to consciousness. However, they can still absorb damage you might take from attacks.

I could do this all day
The first time an Orc or Half-orc drops to 0 damage, they instead drop to 1hp and can keep wailing on you.

Get Out Of There!
Disengage if you need to make a tactical retreat. Teleporting doesn't incur attacks of opportunity, and creatures that have already used their reaction can't make another!

Be careful what
Casting a Wish spell to do anything other than replicating a lower-level spell has a detrimental effect on the caster. They'll take damage when casting other spells, and their strength score temporarily drops to 3. There's a chance they can never cast Wish again- so wish responsibly!

No Blood From a Stone
The good things about being petrified, is that you're resistant to all damage, immune to poison and disease, and no longer age! All positive really.

Be prepared
Wizards can copy down spells from scrolls or other spell books. It's always good to have as many options as possible when going into a new situation.

So inspirational
If you have bardic inspiration, you can add it to any attack roll or ability check you make. These creatives are so encouraging!

Are you still there?
Attacks of opportunity can only be taken against creatures you can see. If the creature is invisible, or the attacker is blinded, they can't react. That's what blind fighting is for!

Where'd They Go?
To hide, you must be behind at least 3/4 cover and out of sight of any enemies.

As a Skunk
When poisoned, creatures have disadvantage on attack rolls and ability checks. Being drunk is a kind of poisoned, so go easy on that Dwarven whiskey.

It's a Knockout!
When you make a strike that would kill a creature, you can instead choose to knock it out, rendering it unconscious.

Horse Armor
Your mount can wear any type of armor a player character can. Barding costs four times as much as humanoid armor and is twice as heavy.

Go on, git!
The Cleric's Turn Undead feature forces any creature with the 'undead' type to run from the Cleric unless it makes a wisdom save. It doesn't mean the Cleric transforms into an undead itself.

Can I Help You?
When using the Help action, you can give advantage to another player making an ability check, or distract a creature within 5ft to give the next attack on that creature advantage.

Ki Worker
The Monk's Ki or Focus points let them perform extraordinary actions, such as doubling their jump distance, or make multiple unarmed strikes per turn.

Oh, I'm Sorry...
If you're concentrating on a spell and take damage, you need to make a constitution saving throw. The DC is either 10 or half the damage taken, whichever is higher.

I Can't Hold It Much Longer!
If you ready a spell, you cast it as normal but hold the energy, realising it using your reaction. Holding a readied spell requires concentration.

Cat Dash
Tabaxi can choose to move double their movement on their turn- although they can't do this again until they spend a turn not moving.

All For One!
In a group check, everybody rolls. If at least half the group succeeds, everyone does! If not...

Encore!
The Fighter's Action Surge lets them take another action on the same turn! Time it wisely!